drivers/net/fec_mpc52xx_phy.c

   1 /*
   2  * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
   3  *
   4  * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
   5  * Copyright (C) 2008  Wolfram Sang, Pengutronix
   6  *
   7  * This file is licensed under the terms of the GNU General Public License
   8  * version 2. This program is licensed "as is" without any warranty of any
   9  * kind, whether express or implied.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/phy.h>
  16 #include <linux/of_platform.h>
  17 #include <asm/io.h>
  18 #include <asm/mpc52xx.h>
  19 #include "fec_mpc52xx.h"
  20
  21 struct mpc52xx_fec_mdio_priv {
  22         struct mpc52xx_fec __iomem *regs;
  23 };
  24
  25 static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
  26                 int reg, u32 value)
  27 {
  28         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  29         struct mpc52xx_fec __iomem *fec;
  30         int tries = 100;
  31
  32         value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  33         value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  34
  35         fec = priv->regs;
  36         out_be32(&fec->ievent, FEC_IEVENT_MII);
  37         out_be32(&priv->regs->mii_data, value);
  38
  39         /* wait for it to finish, this takes about 23 us on lite5200b */
  40         while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  41                 udelay(5);
  42
  43         if (!tries)
  44                 return -ETIMEDOUT;
  45
  46         return value & FEC_MII_DATA_OP_RD ?
  47                 in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
  48 }
  49
  50 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  51 {
  52         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
  53 }
  54
  55 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
  56                 u16 data)
  57 {
  58         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
  59                 data | FEC_MII_WRITE_FRAME);
  60 }
  61
  62 static int mpc52xx_fec_mdio_probe(struct of_device *of,
  63                 const struct of_device_id *match)
  64 {
  65         struct device *dev = &of->dev;
  66         struct device_node *np = of->node;
  67         struct device_node *child = NULL;
  68         struct mii_bus *bus;
  69         struct mpc52xx_fec_mdio_priv *priv;
  70         struct resource res = {};
  71         int err;
  72         int i;
  73
  74         bus = mdiobus_alloc();
  75         if (bus == NULL)
  76                 return -ENOMEM;
  77         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  78         if (priv == NULL) {
  79                 err = -ENOMEM;
  80                 goto out_free;
  81         }
  82
  83         bus->name = "mpc52xx MII bus";
  84         bus->read = mpc52xx_fec_mdio_read;
  85         bus->write = mpc52xx_fec_mdio_write;
  86
  87         /* setup irqs */
  88         bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
  89         if (bus->irq == NULL) {
  90                 err = -ENOMEM;
  91                 goto out_free;
  92         }
  93         for (i=0; i<PHY_MAX_ADDR; i++)
  94                 bus->irq[i] = PHY_POLL;
  95
  96         while ((child = of_get_next_child(np, child)) != NULL) {
  97                 int irq = irq_of_parse_and_map(child, 0);
  98                 if (irq != NO_IRQ) {
  99                         const u32 *id = of_get_property(child, "reg", NULL);
 100                         if (id)
 101                                 bus->irq[*id] = irq;
 102                 }
 103         }
 104
 105         /* setup registers */
 106         err = of_address_to_resource(np, 0, &res);
 107         if (err)
 108                 goto out_free;
 109         priv->regs = ioremap(res.start, res.end - res.start + 1);
 110         if (priv->regs == NULL) {
 111                 err = -ENOMEM;
 112                 goto out_free;
 113         }
 114
 115         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 116         bus->priv = priv;
 117
 118         bus->parent = dev;
 119         dev_set_drvdata(dev, bus);
 120
 121         /* set MII speed */
 122         out_be32(&priv->regs->mii_speed,
 123                 ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
 124
 125         /* enable MII interrupt */
 126         out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
 127
 128         err = mdiobus_register(bus);
 129         if (err)
 130                 goto out_unmap;
 131
 132         return 0;
 133
 134  out_unmap:
 135         iounmap(priv->regs);
 136  out_free:
 137         for (i=0; i<PHY_MAX_ADDR; i++)
 138                 if (bus->irq[i] != PHY_POLL)
 139                         irq_dispose_mapping(bus->irq[i]);
 140         kfree(bus->irq);
 141         kfree(priv);
 142         mdiobus_free(bus);
 143
 144         return err;
 145 }
 146
 147 static int mpc52xx_fec_mdio_remove(struct of_device *of)
 148 {
 149         struct device *dev = &of->dev;
 150         struct mii_bus *bus = dev_get_drvdata(dev);
 151         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 152         int i;
 153
 154         mdiobus_unregister(bus);
 155         dev_set_drvdata(dev, NULL);
 156
 157         iounmap(priv->regs);
 158         for (i=0; i<PHY_MAX_ADDR; i++)
 159                 if (bus->irq[i])
 160                         irq_dispose_mapping(bus->irq[i]);
 161         kfree(priv);
 162         kfree(bus->irq);
 163         mdiobus_free(bus);
 164
 165         return 0;
 166 }
 167
 168
 169 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 170         { .compatible = "fsl,mpc5200b-mdio", },
 171         { .compatible = "fsl,mpc5200-mdio", },
 172         { .compatible = "mpc5200b-fec-phy", },
 173         {}
 174 };
 175
 176 struct of_platform_driver mpc52xx_fec_mdio_driver = {
 177         .name = "mpc5200b-fec-phy",
 178         .probe = mpc52xx_fec_mdio_probe,
 179         .remove = mpc52xx_fec_mdio_remove,
 180         .match_table = mpc52xx_fec_mdio_match,
 181 };
 182
 183 /* let fec driver call it, since this has to be registered before it */
 184 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 185
 186
 187 MODULE_LICENSE("Dual BSD/GPL");